# Summer 2012 8th Grade Math Vocabulary

## 14 terms · Learn these words over the summer. Be prepared for a test on them when you return in August.

### Perpendicular Lines

lines that meet at right angles

### Parallel Lines

lines that never intersect

### Reflection

a transformation that flips a figure across a line

### Rotation

a transformation that spins a figure around a point

### Translation

a transformation that slides a figure without rotating or flipping it

### Evaluate

the process of plugging in a number for a variable and simplifying

### Simplify

combining like terms, not solving a mathematical expression

### Solve

finding the solution or value of a variable

### Union

combining two or more sets together

### Intersection

the terms two or more sets have in common

### Supplementary angles

two angles that add to 180 degrees

### Complementary angles

two angles that add to 90 degrees

### Integer

the set of whole numbers and their opposites

### Slope

the steepness of a line, rise over run